1011808990 has 8 divisors (see below), whose sum is σ = 1821256200. Its totient is φ = 404723592.

The previous prime is 1011808961. The next prime is 1011808999. The reversal of 1011808990 is 998081101.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011808999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50590440 + ... + 50590459.

It is an arithmetic number, because the mean of its divisors is an integer number (227657025).

Almost surely, 2^1011808990 is an apocalyptic number.

1011808990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1011808990 is a deficient number, since it is larger than the sum of its proper divisors (809447210).

1011808990 is a wasteful number, since it uses less digits than its factorization.

1011808990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101180906.

The product of its (nonzero) digits is 5184, while the sum is 37.

The square root of 1011808990 is about 31808.9451255461. The cubic root of 1011808990 is about 1003.9209361664.

The spelling of 1011808990 in words is "one billion, eleven million, eight hundred eight thousand, nine hundred ninety".